linux-kernel - [PATCH] Documentation: document hung_task

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Message-Id: <53ad4158547699c2d35ba817394750dc2487158a.1526926625.git.osandov@fb.com>
Date:   Mon, 21 May 2018 11:18:17 -0700
From:   Omar Sandoval <osandov@...ndov.com>
To:     Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com
Subject: [PATCH] Documentation: document hung_task_panic kernel parameter

From: Omar Sandoval <osandov@...com>

This parameter has been around since commit e162b39a368f ("softlockup:
decouple hung tasks check from softlockup detection") in 2009 but was
never documented.

Signed-off-by: Omar Sandoval <osandov@...com>
---
 Documentation/admin-guide/kernel-parameters.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 11fc28ecdb6d..4e37bebdc3d0 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1341,6 +1341,16 @@
 			x86-64 are 2M (when the CPU supports "pse") and 1G
 			(when the CPU supports the "pdpe1gb" cpuinfo flag).
 
+	hung_task_panic=
+			[KNL] Should the hung task detector generate panics.
+			Format: <integer>
+
+			A nonzero value instructs the kernel to panic when a
+			hung task is detected. The default value is controlled
+			by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
+			option. The value selected by this boot parameter can
+			be changed later by the kernel.hung_task_panic sysctl.
+
 	hvc_iucv=	[S390] Number of z/VM IUCV hypervisor console (HVC)
 			       terminal devices. Valid values: 0..8
 	hvc_iucv_allow=	[S390] Comma-separated list of z/VM user IDs.
-- 
2.17.0